Titanium-coated stainless steel crowfoot heads (reduce marring, tight tolerances).
Heavy-duty 1/2″ drive torque wrench included (adjustable ~10–150 ft-lb, ±~4% accuracy) with a 45-tooth ratchet head.
Kits typically include specialized, single-purpose crowfoot profiles for common AR components plus a molded foam case for organization.
If you only swap muzzle devices and castle nuts occasionally, the 5-pc may be enough; build/armorer work favors the full 13-pc kit.
Match the crowfoot heads in the kit to the parts you own (A2, flash hider, 3-prong, free-float barrel nut patterns, etc.).
Always torque to the component/manufacturer spec (this wrench covers the range for most AR-15 torque needs).